B2920
I was plowing snow a couple of weeks ago with a rear blade on the three point. At the tail end of my plowing, I found that the blade was lifting very slowly. Eventually, it would not lift at all. HST was no problem. Temperature was just about freezing, so I would not suspect any water in the HST. And the problem continues now that it is 45° or more.
I made it back to my shop, dragging the blade the whole way, checked to ensure that the hydraulic fluid level was fine, and did some tests. I found that I could not raise the blade or FEL bucket. But I can curl the bucket, and if I engage the bucket raise while curling the bucket , I can raise the bucket simultaneously and even continue to raise after stopping the curl. Even then, though, I still cannot raise the blade. I loosened the three-point limit bolt/plate to allow the lever more travel, but still no lift on the three-point.
On the advice of my local Kubota shop, I shut it all down, disconnected & reconnected every hydraulic quick release I could find: I think it was four going to the FEL and one at the rear--the one that I would disconnect and connect to the backhoe. There may be others; I did not dig very deeply yet.
Earlier in the summer, we had rolled a branch up and broken off the HST filter stud on the left side, so I had replaced the filter and stud with base. That is, I do not suspect a plugged filter, since I just replaced it maybe 2-3 months ago.
It seems like this might indicate a stuck relief valve. If so, where is it, and why would it behave like this--unable to raise 3-point but always able to curl the bucket and able to raise bucket only during/after curl?
I was plowing snow a couple of weeks ago with a rear blade on the three point. At the tail end of my plowing, I found that the blade was lifting very slowly. Eventually, it would not lift at all. HST was no problem. Temperature was just about freezing, so I would not suspect any water in the HST. And the problem continues now that it is 45° or more.
I made it back to my shop, dragging the blade the whole way, checked to ensure that the hydraulic fluid level was fine, and did some tests. I found that I could not raise the blade or FEL bucket. But I can curl the bucket, and if I engage the bucket raise while curling the bucket , I can raise the bucket simultaneously and even continue to raise after stopping the curl. Even then, though, I still cannot raise the blade. I loosened the three-point limit bolt/plate to allow the lever more travel, but still no lift on the three-point.
On the advice of my local Kubota shop, I shut it all down, disconnected & reconnected every hydraulic quick release I could find: I think it was four going to the FEL and one at the rear--the one that I would disconnect and connect to the backhoe. There may be others; I did not dig very deeply yet.
Earlier in the summer, we had rolled a branch up and broken off the HST filter stud on the left side, so I had replaced the filter and stud with base. That is, I do not suspect a plugged filter, since I just replaced it maybe 2-3 months ago.
It seems like this might indicate a stuck relief valve. If so, where is it, and why would it behave like this--unable to raise 3-point but always able to curl the bucket and able to raise bucket only during/after curl?